Learn what "someone must have followed him last night" means, when people say it, and how to use it naturally in English.

The speaker is making a strong guess that someone tracked him the previous night.
From On One Condition, Episode 53
The speaker guesses that someone secretly followed him the night before.
Use this when making a deduction about a hidden or suspicious event. It is more useful as an explanation than as a standalone phrase page.
Scenes unlock real expressions as you watch
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